Permutation-lock.



cfM. ADAMS.

PERMUTATION LOCK.

APPLICATION FILED AUG-4,1916.

ifimjfige Patented Jan. 30, 1917.

2 SHEETS-SHEIET 1.

C. M. ADAMS.

PERMUTATION LOCK.

APPLICATION FILED AUG.4. 1915.

Patented Jan. 30, 1917.

2 SHEETS-SHEET 2- Witnesses Attorneys.

UNITE CLARENCE M. ADAMS, or nossvrtrin, GEORGIA.

PERMUTATION-LOCK.

Specification of Letters Patent.

Patented Jan. 30, 1917.

Application filed August 4, 1916. Serial No. 113,176.

To all whom it may concern:

Be it known that I, CLARENCE M. ADAMS, a citizen of the United States, residing at Rossville, in the county of Walker and State of Georgia, have invented a new and useful Permutation-Lock, of which the following is a specification.

The present invention appertains to permutation locks, and aims to provide a novel and improved mechanism of that character for use upon safes and elsewhere to hold a door or other'objects in aolosed or locked position, and permitting of the opening of the look only by a predetermined manipulation thereof.

It is the object of the invention to provide a permutation lock embodying but few parts, which is simple in construction and operation yet thoroughly practical and efficient in use.

As a more specific object the invention aims to provide in a permutation look, a detent for holding a lock bolt in projected position, and a plurality of tumbler cams, which when arranged in a predetermined position will result in the detent being so moved that the lock bolt can be retracted.

WVith the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departure from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein Figure 1 is a front view of the lock. Fig. 2 is a rear view thereof with the back plate removed. Fig. 3 is a horizontal section taken on the line 33 of Fig. 2 showing the detent in operative position. Fig. 1 is a vertical section taken on the line. l 1 of Fig. 2 showing the detent in inoperative position. Figs. 5 and 6 are sectional details taken on the perspective section lines 55 and 66 of Fig. 2.

The present lock, which can be applied to safes and various other structures, embodies a casing or frame 1 in which a latch or look bolt 2 is slidable, a guide 3 for said bolt being provided in the casing. In order to retract the lock bolt, the same is provided with rack teeth 4 meshing with a pinion 5 mounted upon a spindle 6 j ournaled for rotation through the face plate of the casing and having a knob 7 adapted to be rotated by hand for rotating the pinion so as to retract the lock bolt. Said lock bolt is normally projected by a leaf or other suitable spring 8 bearing against the heel thereof. In order to hold the lock bolt in projected position a detent 9 is hinged or pivoted as at 10 within the casing in rear of the lock bolt and projects toward said bolt, so that when the bolt is projected the detent can be swung into alinement with the bolt with its free end abutting the heel end of the bolt. This will prevent the lock bolt being retracted unless the detent is swung out of the path thereof. The leaf spring 11 secured to the casing bears against the detent to swing it into operative position and this spring is of just sufficient tension to carry the detent in back of the lock bolt when the same is projected. Any other suitable weak spring can be used in place of the leaf spring 11.

The detent 9 is controlled by a pair of rotatable tumblers above and below the detent and each embodying aspindle 12 j ournaled through the face plate of the casingand having a knob 13 upon the outer side of the face plate adapted to be rotated by hand, tumbler cams or members 1 1 being mounted upon the spindles 12 within the casing and having V-shaped cam faces or ridges 15, said cams project radially from the spindles. A rocking element 16 is disposed transversely across the detent 9 and is pivotally connected therewith intermediately its ends, said rocker 16 being formed of wire or other suitable stock and having a coil 17 between its ends mounted for oscillation upon a longitudinal fulcrum pin 18 carried by the detent. The rocker 16 is disposed vertically, while the detent is arranged horizontally, that is, when the lock is arranged in a vertical plane as illustrated.

The ends of the rocker 16 are provided with the V-shaped projections or bends 19 engageable with the tumbler cams 14L. The face plate of the casing is provided with dials or graduations 20 with which pointers 21 carried by the knobs 13 are cooperable to facilitate the setting of the cams to proper position for opening the look.

In operation, the look bolt is normally projected by its spring and when the cams are disarranged, as seen in full lines in Fig. 2, the detent 9 is swung to operative position by its spring, thereby preventing the retraction of the lock bolt unless the cams are set in a predetermined position.v When one or both of the cams 1 1 are removed from the projections 19 of the rocker 16 the de tent is free to move to bolt holding position and it is necessary to set both cams 14 in a predetermined position before the lock bolt can be released. To release the lock bolt, the cams are turned to proper position through the assistance of the dials 20 and pointers 21 whereby the cams 1 1 are being rotated to such positions will cause the pro- 7. jections 19 of the rocker 16 to rise upon the inclined sides of the cam. faces 15, and said projections will bear against the ridges of said cam faces. As a result both ends of the rocker 16 will be moved by the cams 14.- away from the plane of the detent 9 and the free end of the detent will be carried with the rocker, thus removing-it from the heel of the lock bolt so that the lock bolt can be retracted easily. It is necessary for both cams to be set properly, since if only one end of the rocker 16 is moved to position by the respective cam 14, the rocker will simply oscillate relative to the detent without appreciably releasing the detent from the bolt. The arrangement is such that it is necessary for the corners of the projections 19 to rest directly against the ridges of the cams 14: to move the detent to releasing position, which necessitates the setting of the cams accurately, to avoid the opening of the look by a person unfamiliar with the combination, and by simply turning one of the cams slightly, the combination is destroyed and the detent permitted to move behind the lock bolt.

The present construction and combination of elements is a simple yet thoroughly practical one and permits of many changes in the combination by setting the cams 14: and pointers 21 at different angles relative to one another.

Having thus described the invention What is claimed as new is:

1. In a permutation lock,.a locking member, a movably mounted detent for holding it, a plurality of individually operable members, movable meanscarried by the detent and cooperable with said operable members, said operable members being arranged, when moved to a predetermined position, to conjointly move said means so that it carries the detent to releasing'position.

2. In a permutation look, a locking mem-' rocker pivoted to the detent between its. ends, and mdependently operable means 00- operable with the arms of the rocker andarranged, when moved to a predetermined position, to move the rocker for carrying the detent with it to releasing position.

4. In a permutation look, a locking member, a movable detent for holding it, a rocker pivoted between its ends to the detent, and a'pair of tumbler members .00- operable with the arms of the rocker and arranged, when moved to a predetermined position, to move 'said ro'cker for carrying the detent with it to releasing position.

5. In a permutation look, a locking ,mem ber, a movable detent for holding it, a rocker pivoted to the detent having projections, and a plurality of individually operable cams arranged, when moved to simultaneously engage said projections, to move said rocker for carrying the detent with it to releasing position.

6. In a permutation look, a locking member, a movable detent for holding it, a

rocker pivoted between its ends to thede tent, and havlng projections upon its arms,

rotatable cams having ridges engageable with said projections and arranged when moved to slmultaneously engage said projections, to move said rocker for carrying the detentwith it to releasing position.

7. In a permutation lock, a lock bolt, a

pivoted detent behind the lock bolt having its free end arranged to abut the lock bolt,

a rocker pivoted between its ends to the do tent, and a pair of tumbler cams cooperable with the arms of said rocker and arranged, when moved to a predetermined position, to move said rocker for carrying the detent with it.

In testimonythat I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

' CLARENCE M. ADAMS.

Witnesses: D. D. ROGER, J. N. MoCRAoKEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. O. 

